June 2017
Beginner to intermediate
404 pages
8h 22m
English
Content preview from Learning Elasticsearch
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Node failures
Failure detection is also an important functionality that the discovery module takes care of. Master nodes ping all the nodes in the cluster frequently to make sure they are alive as shown in the following diagram. In the same way, all the non-master nodes ping the master node regularly to ensure the master node is alive. If any failures are detected, they are handled as we described in the Failure Handling section in Chapter 1, Introduction to Elasticsearch.
Frequent garbage collections on a node can make it look like a dead node due to thestop_the_world phase. During the stop_the_world phase, the node can't respond to the ping from other nodes; the node might be mistaken for a dead node. In reality, it just couldn't respond ...
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